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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f79a29adb33cc20e7b5b5dfb842895da8a5b854927136b0a394bdab299e45a' 
  AND token = 'X4WB/5g1Fh7zeBQZ8z5PIbxOHZYKx5L7X1nejxGEBvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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