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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f752306c2791171a2845ac79128372990d1e7484d9492a7f90efc865ed3bd0b9' 
  AND token = 'MO6aRBH3t5YteLhSvzZMkWbUH9uB/T81Hx37DdlLjow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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