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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf51bae6063cfb5246948d971f5188bd5494018c784f2e36968edd0ec34d5bd' 
  AND token = 'BmaD5y1QaFmQJWTVEW6RA33uw58du0UYZy0oI8AG4Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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