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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c2bd9e5a9b38604686404ade30db15e8254e8bbc9f3f4d7b6e64d1f89fd471' 
  AND token = 'XapcHV0PQcojwb+wESavRdWLFs4IY0RElSy8EBx6Vlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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