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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e383bbd1271388520a946de7bcb61ce0b1936ef3c4b2ca01b6a8b8af9d62aae' 
  AND token = 'z/ZQu7oaToj/X2U5rUM0P3gR5fegbsjOepIIMPWUrEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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