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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0777ed31646efac65b0b333cfcf510126d2169d2a176da90ba0e13def7e12d' 
  AND token = 'QFs0vOLdO/zCmlAVLA2lr/khsnlDg1l13BoQTwm9iMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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