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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509c7bec944c545ad38763e74011b5c13920ba5c4f5dfae45ae71389b8b0a8f3' 
  AND token = 'x7lYq/isdYHCO0+xDfVvfYMGKIfipkoaoES0RMEQvNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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