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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a10b474e031eecaf8b40f5d72eeea10869bb9cf6c6670a26093b56a071d2bcb' 
  AND token = '7J9weOw2cj3GnjNaIPq3AyLnpr9IuaO3XsO0cR/bBoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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