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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72fb6ce95cca359db078d8e2bcb1586e7eb0459be6992dd8140f776795e2afd4' 
  AND token = 'rBbw/KnhXETmMw7jevR3CTlSJeonUHJaS4vUHM8oeQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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