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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3af6644eb44d5423c37192c5453d1c5cbff69fd298078ad72a500b1d1f3b3c4' 
  AND token = 'ziKV7QP55JXyma1sJQfMvXzOI0nCqExpIVdu6y9XX24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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