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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b1c7935c97d12f0d99d67d1163f7ffe83786315fe4313b4427e2f15e2dd9c9' 
  AND token = 'EVF+tWuQvplw10zvRTpdZfL8fn8VvYcS8xOd5nd6yIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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