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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bba242b8b3eab4892031433c97b6f4fcf7b6066cf66d268993cedf9bb0255a7' 
  AND token = 'Q+pnoZ1cTArInEZg6NaNZMd9NLX7twpK0fdRZJifUyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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