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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8bf94a6cb8ed68e77b8e6feb3fa8edf10bb75905cc2e1c351619aa2156f58a' 
  AND token = 'v6uSIKvsbWxMupf1on3moQE5I9zE/qxxwAQUkb8GPPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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