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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c5f8c69647ef8dd54fcb062c54e1d7877269ff51988c3777098b59c816c55b' 
  AND token = 'oijFgh/kKLHrLOJmfJUnZZ5yA7Dr+ElkfQpIzPStbic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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