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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860368c4741742e27f2cf8c574a5f828db9f54cf73900c0a4013593a8768984a' 
  AND token = 'sp7WPyAcagzIdMxSie7dmXYMlpjX3bGNiUaqTHnvLrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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