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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ace12b63563381deff869b04fa687c0d16005eb2e61c77fb486d01e24d021b' 
  AND token = 'GxhgJb3MK9j+a+2dwgvT6xJRt2mPJVQZ2ejnc0c3r9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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