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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8a7c966787c9332969e38ca135b11208e980a91de08d61d8d463b70646f5da' 
  AND token = 'xEur+Jfmeg0USzs2awcAn8nRcqOgYv6NxFm42sObF68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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