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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53a19e6a64b93dba324ce7f6357a2fd0ae6441e4879f642805e49c270028be8e' 
  AND token = 'lC8E+lA16NL21779umEyLdLq28be4ZLqpTjJb6khH/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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