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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0709df03da44ee27ef6d04424de54056baec8038d2631c608949934d26a6c529' 
  AND token = '93SPEx8ur477dN4RQeSByG+mnripZxc/fXl0P/Nqgk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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