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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706876ff9a68fa471c0594fa9195501e0271d2c2667f69d1a2961ff88163b3b5' 
  AND token = 'b9uiNUQ+I5iBC0uV+Yc9ouyeOAcC8JIM75xYXc3b7ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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