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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebd3f2257433173b0b5300eeb72ab7cac6b2061689e7e08de9a0cf61e82c2ea' 
  AND token = 'hml0ufZOsogiCpVKISdojyj9AKzOrQmAU3BsUMqW7LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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