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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b1cb149273177a768392ee788099bf27d03d4446198b55c1689c22fbc4878d' 
  AND token = 'g4rvkvNBs2xrth/JObl6kj32ZaE09bA6eZUvw4mm7hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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