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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55dfdad291954e87e5c5785774b29627397bc106e7a1859e5aa53c783bbc5eaf' 
  AND token = 'JxVZmyfPTeIyZgQGMYz79RmS0ru1/Zik5XgbzqjhXyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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