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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d36fe8726ae24dc427da5ea4904d513eaa8acacbe1523fa91e48324a584e1a' 
  AND token = 'F5sXoZg2Ahj/DZ3m1rsyK+pvUFjBFdl1gS9RsGHPoe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}