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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b785e9e964450d022689be63e2a52f8168d3dfe5497de88e937f0c3927ed72e' 
  AND token = 'AWuLrdJR4XuM/zn+zHaiUN9F3dzwQwpdTEnOK4bTJDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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