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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91125a4cfaaa066d76a24d449412ab8093e83f6097619bc36670f3407cd3dc31' 
  AND token = 'htLBSWlCjXeAh9dyXY2+Fo7Pd/HC1u+uKm3deU526Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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