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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0c4fa5f73a270b32329dc418e1faf804f974455c7327a77f77180701b9432d' 
  AND token = 'NNe/WE4Rfnlwas5nQmvEB76xyij6qXi1N/RT7d9Ftto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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