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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5eb3b92dc79efba54c566825338cdf384dbcffef297b4db88495c52c264f4a' 
  AND token = 'JhagqkSXxdrSeGSgK5ASLqBhwIaakAiGbCbE+vGd+9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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