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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69873bf3d57d50bc93f7789a3cb54b17ad09cfe078d1cbcbcf307dc301ec0f6' 
  AND token = 'sncushyRs/Su6kkrWFZfKOW+LoBLXDKAb+UE8jfasG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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