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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41145d6a057c5ee2991722cc62687cc6e41fa6507d4f4135a0377b848a78dc8d' 
  AND token = 'KjclCdYChCC0u3ERoI6pCTP1O2lusUUKPb8eiS4wp8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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