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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3a883a6959700b4b4a071d30843354e5b52fb04d2538856c1c6126bc81de0f' 
  AND token = '4FTLctC0sXMfoS0zOxICtFoONDHRzOmonGwANf4uvog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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