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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0fcc0e1de93c0fa47b7b611fe51187dd3e2fdc5e3d59568773a74b2608275ac' 
  AND token = '9tTATE26SLg1HP7AkUHK+4k+zsKDEymo8UmL37K14qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00120

JSON explain

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