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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086aa2e4b75d63d5f33ea1bbc88338370b31052902cf2b703985d1fbd7dcdd7d' 
  AND token = 'ZRmv5VRKVYOq3t7Vb5RxhhsDpXx9GD8P2tOSiNWi6UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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