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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a4b4daff9a6ba462ff68d38c9a136fbf57d5856547507de9b92e43dc7629e76' 
  AND token = 'a1k00sXaf/MkaLE884HLmfbOcLxXp+ZWz6AOxqciTGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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