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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a248307be27007c6da5c365298c87f9977749bc1e2dc92d3466d4165e39a233c' 
  AND token = 'Bo3aa5WSzITJ2mNGE3+WQB96gjKU3CNdzCMgEBMa8tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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