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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df58002cb8ff355bb607ca3de0c1bb8c7f1e31d33d33e4d41f524c821abcef7' 
  AND token = 'FDO1OUpaag1XrRDeHj9A09krCZauG9/t5El3k3+LBQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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