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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf1cc2a9d55cb4823d9ed0f457fb460f520b4f5178742fd4f758b5271aa8767' 
  AND token = '/T2aYsf1SFxJ//WcydsImkXNGpyEVgX8LUbBLVLDAZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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