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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b38cfdca1ec1f9e00b2da44ecf11cabd1ec36d8ce4b485c821ee98f865a88a' 
  AND token = 'rZOQTHDXzf5AtWm5k/CH2CoUeSc+4fSSs/fHfyza2Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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