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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989a886e9ff01e4fbc0a22c9eafea9044ab2ea6bb0878136f89da00ae87ef8dc' 
  AND token = 'v/cUAA2ZfgtyigYFjerWRUzWDSnUdgIpES6liS1JUHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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