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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba8b474c61e4f318d123e027254ba0d16b688201628f29c2ac138e7cb36cc20' 
  AND token = '/7loV7z9hnXWy673/zCM8feAZJPH8f99kPfJLcPWQFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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