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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7475bea7156de3d2b2bbf9c4ed45edb52bda26bc682347b4bbe56bb5fc66b1df' 
  AND token = 'IB25C9nRxhJgWQhXbmrjwAFE5UoalnpeVkIWUGprm+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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