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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd69be08b4d1171feba0babd5167ca4475bf9b26343501d8ab92e90ecba5c3e' 
  AND token = 'YIQ+i3JAJxu6WauCGJqxpkouW3/SFULzFMIaecCbOAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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