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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eac53693bb053b148d6defa705b0bcd14381b292847e3a72191bb67b84ce2a9' 
  AND token = '75Gx06pEiNrcODmpDgxSFq0v9s0/r9ur30URy5uLrGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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