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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9895fa896d860c2d7e641219031ccc86c31e8312c5762458906ddd5999fc63' 
  AND token = 'Z2AQ+B97na5ONZgn39phXxUXyxVctvOKunSB72WQ2jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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