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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc090c0f16e0e27991928f3b53d7616b18c69d1b7422f0c30d4f7624b882666' 
  AND token = 'dlf05Au4+LRvDlHyHzI/luhO8ZG68ni/7VwpMsmGlcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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