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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698cf9b4fecee39cc08680ad23116153ca12208c0fb58f1e0b3e11992eceb0ec' 
  AND token = 'gMG9LI9HbYpuaeI6y10ln3GlUwit7az4QW/laMgOLoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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