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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f663409d294bfe164d2fbf660421173677f7d56df77ceda9a5008fc948d88111' 
  AND token = 'Ms39PE2vilcf2BzKtrUaURdvHPbkHZdl930bU8heHW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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