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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5fee16730c8d8a6e4193aa130b138bb8dcf2b1a2fe98f2402c7460df1b27d4f' 
  AND token = 'VDFKhsH8WoNPb7iqlptdqFkBLeI1Yd8K7OYZzxRNG74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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