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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51982ca706c28f6428092b81bbab1ee704f45498e29aa1d468a884d8c7a918a3' 
  AND token = 'OkZZLmTpNd+jHIPSud/Y1Q26AIuQzF/gCzAbqnxANlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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