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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f6c40c76806f0d85b6fa98ef657d1730f1a98264e97caa739fda749592afaf' 
  AND token = 'xMuUEFVSVhKMCs5GTw02iJ/8odh6hX8YUHnzlPEMVs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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