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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab67d6d068b6e2dc255675d336ba4507510b80252177df723e4824437abefbbe' 
  AND token = 'c+f1UrOhy4uN0/LLDHIQWLCSSLZFPBZCgnX1oQvwKRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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