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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aefea9e085557f79debc9e9784a55d110eca1a9b0b94cb68bd3ef199f6f8bc6' 
  AND token = '3Dr1J8z53IINsfwdaCRJBcagXMvIdwq+AcyhVfjrzno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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