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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c814a31f108320ee3db71a6b80b690fa209b5edabf31972bc0f20aab58f2a9' 
  AND token = 'U1UXxU6LXcMNRPkvv6bJhQJXrBvse+W+x71Lz8xkxb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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