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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4472effd0bde55087a53f8fa246b3e3846de88958ddebfdbaa93935406c40a63' 
  AND token = 'X/PsQNkvPbnOr1CPmNL2uU/SUpP6aECSZfaQPnDF6Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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