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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f18aff4107590db01f4461f34822020c802c9d5adf5a10012c2985e9de904837' 
  AND token = 'ju/bAFRsc2NvFrV/p2YK3M32v/Vu2IS1jcO/FrmsIis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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