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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9fe59787b214e89a30750d86f5676af3621a4aa7de8bac535766947dc4e1dca' 
  AND token = 'F77gRa/1Er0ncAzWWGnAkL7JhJ6RMG8riUCOAgNSMEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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