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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f6a7e1cef0f1484b270ac25c5a708fb5ccc871e0fecaae2893868cfc922d32' 
  AND token = 'u4LDCB6wL9dMOl6cl+Jfe0j2u/D7KJAVVYEgVy6l4+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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